Jack-screw head.



H. D. CRYSTAL. JACK SCREW HEAD. APPLIOATION FILED OOT. 26,1903.

908, 2 1 O, Patentedflec. 29, 1908.

[71/ (/0 14/ [for MB GR STAZI A to mug w wifnoss s 49m HERBERT D.CRYSTAL, OF WEED, CALIFORNIA.

JACK-SCREW HEAD.

Specification of Letters Patent.

Patented. Dec. 29, 1908.

Application filed October 26, 1908. Serial No. 459,582.

To all whom it may concern:

Be it known that I HERBERT D. CRYSTAL, a citizen of the United States,residing at eed, in the county of Siskiyou and State of California, haveinvented a new and useful J ack-Screw Head, of which the following is aspecification in such full and clear terms as will enable those skilledin the art to construct and use the same.

This invention relates to a device used for the purpose of centeringshafting when the journal boxes thereof are to be babbitted.

Another object of the invention is to provide a device which may beapplied to any jack screw head to make it applicable for the purpose ofbabbitting the boxes of shafting.

In almost every industrial establishment there are a number of jackscrews, but a jack screw alone is not suflicient to center a line ofshafting when the boxes are in need of repair, and to provide a machinefor the purpose of centering the shafting would be too expensive, butwith this invention a small extra head is secured to the jack screw headand at once makes possible to perfect adjustment of the shafting.

In the drawing, Figure 1 is a plan view of the device, Fig. 2 is a sideView of the same, and Fig. 3 is an end view showing the device attachedto a screw head.

The jack screw is numbered 1, the head thereof being of any common form,since this adjusting device is adapted to be secured to any jack screw.The device is formed with the base plate 2 which has the upstanding ears3 at each end thereof and the depending ears 4 under the ears 3 Each ofthe ears is provided with a set screw, the lower pair having curvedclamps 5 secured on the ends of the set screws to provide means toattach the adjusting device to the head of any jack screw. The plate 2is provided with a groove which runs from the ear 3 at one end to theear 3 at the other end thereof, and in this groove travels a block 6having a V for the shaft to rest in. This block 6 is held in place bymeans of the plates 7 and 8 which are secured to the base plate 2 bymeans of the bolts 9, said plates taking in a groove in the side of theslidable block 6.

The operation of the device is as follows: The base plate is secured tothe jack screw to be used by setting up the screws in the ears 4 tillthe clamps hold the jack screw head tightly, the jack screw is thenplaced under the shaft and the same is lifted to the proper height byoperating the jack screw. Since the shaft never has to be moved any veryconsiderable amount to center it in the journal boX, the horizontaladjustment can be made without moving the jack at the base, the screwsin the ears 3 affording all the motion necessary. It will thus be seenthat any jack can be easily and quickly equipped with means whereby ashaft may be moved in two planes.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent of the United States is as follows:

1. In a jack screw head, a base plate, means below the base plate tosecure the same to a jack screw head, means carried by the base plate tosupport a shaft, and means to move the shaft support transversely of thehead.

9.. In a jack screw head, a base plate having a pair of depending earsand a pair of upstanding ears, means carried by the lower set of ears tosecure the plate to a jack screw head, means carried by the plate tosupport a shaft and means to move the shaft transversely of the jackscrew head.

3. In a jack screw head, a base plate having a pair of depending earsand a pair of upstanding ears, set screws passing through the dependingears and having clamps on the ends thereof, a slidable block on theplate and adapted to support a shaft, and means passing through theupstanding ears to move the shaft support transversely of the ack screwhead.

4. In a jack screw head, a base plate having a pair of depending earsand a pair of upstanding ears, set screws passing through the dependingears and having clamps on the ends thereof, a block having a V-shapedcut in the top thereof and slidable on the plate, and a set screwpassing through each upstanding ear to move the slidable block acrossthe top of the head.

In testimony whereof I have set my hand this 18th day of October A. D.1908, in the presence of the two subscribed witnesses.

HERBERT D. CRYSTAL.

Witnesses:

FRED H. TEBBE, W. F. WILSON.

